歧口凹陷埕海高斜坡低饱和度油藏形成机制与开发实践——以刘官庄油田馆陶组三段为例

doi:10.3969/j.issn.1672-7703.2021.01.006

摘要/Abstract

摘要： 位于歧口凹陷南缘埕海高斜坡的刘官庄油田，低饱和度油藏分布规律认识不清，具有原油密度高、黏度大及含油饱和度低的特点，热采和化学降黏效果不理想，难以开发动用。通过详细分析低饱和度油藏的形成机制，明确油气远源运移、储层非均质性强、构造幅度宽缓是刘官庄油田馆陶组三段低饱和度油藏形成的主要因素；并结合刘官庄油田低饱和度油藏富集特征，指出埕海高斜坡发育的馆陶组不整合面与其上底砾岩层配置，既是油气输导的主要通道，也是低饱和度含油“箱体”的载体；在刘官庄油田形成以低饱和度油藏为主，常规构造、岩性油气藏为辅，沟槽内“立体含油，整体连片”的油气富集模式。探索“水平井+CO2 吞吐”开发实践，累计实施水平井10 口，单井平均产量由2t 左右，最高上升到50t，采收率提高7.9%，大幅度改善了刘官庄油田低饱和度油藏的开发效果。

关键词: 歧口凹陷, 埕海高斜坡, 刘官庄油田, 低饱和度, 开发实践

Abstract: Liuguanzhuang oilfield, located in the Chenghai high slope area on the southern margin of the Qikou Sag, is characterized
by high density, high viscosity, and low saturation crude oil. However, the distribution law of low saturation oil reservoir is
not clear. This type of oil reservoir is difficult to recover and utilize because measures such as thermal recovery and chemical
viscosity reduction generally produce unsatisfactory results. Taking the Liuguanzhuang oilfield as an example, this paper analyzes
the formation mechanisms of low saturation oil reservoir in detail. The study shows that the main controlling factors of the low
saturation oil reservoir in N1g3 include long distance migration of hydrocarbons from the source, strong heterogeneity of the reservoir,and wide and gentle structures. Considered in combination with the enrichment characteristics of the low saturation oil
reservoir, this indicates that the assemblage of Guantao formation unconformity and its overlying basal conglomerate in the high
slope of the Chenghai area, determines the main channel for hydrocarbon migration and also contains the carrier layer for low
saturation oil—an oil-bearing “box”. The hydrocarbon accumulation pattern in the Liuguanzhuang area is dominated by low
saturation oil reservoirs, supplemented by conventional structural and lithologic oil and gas reservoirs, and with “stereoscopic
oil-bearing and integrated as a whole” in the grooves. The development method of “horizontal well + CO2 huff and puff” has been
implemented in a total of ten horizontal wells, with the average production of a single well rising from about 2 t to up to 50 t, and
the recovery factor improving by 7.9%, which is a great benefit for the development of low saturation oil reservoirs in the
Liuguanzhuang oilfield.

中图分类号:

周立宏, 韩国猛, 董晓伟, 陈长伟, 纪建峥, 马建英, 周连敏, 饶敏, 张睿. 歧口凹陷埕海高斜坡低饱和度油藏形成机制与开发实践——以刘官庄油田馆陶组三段为例[J]. 中国石油勘探, 2021, 26(1): 74-85.

Zhou Lihong, Han Guomeng, Dong Xiaowei, Chen Changwei, Ji Jianzheng, Ma Jianying, Zhou Lianmin, Rao Min, Zhang Rui. Genetic mechanisms and development practice of low saturation oil reservoir in the Chenghai high slope of the Qikou Sag: a case study of the N1g3 oil reservoir in the Liuguanzhuang oilfield#br#[J]. China Petroleum Exploration, 2021, 26(1): 74-85.

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